public bool Read(Stream stream, int directoryCount)
{
int bytesRead = 0;
this.NumTables = WoffBuffer.Read255UInt16(stream);
if (this.NumTables == 0)
{
return(false);
}
this.Flavor = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream, WoffBuffer.SizeOfUInt, out bytesRead), 0);
this.TableIndices = new ushort[this.NumTables];
for (ushort i = 0; i < this.NumTables; i++)
{
this.TableIndices[i] = WoffBuffer.Read255UInt16(stream);
if (this.TableIndices[i] >= directoryCount)
{
Trace.TraceError("Invalid collection font entry: " + this.TableIndices[i]);
return(false);
}
}
return(true);
}
public bool Read(Stream stream)
{
int bytesRead = 0;
this.Version = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream,
WoffBuffer.SizeOfUInt, out bytesRead), 0);
this.NumFonts = WoffBuffer.Read255UInt16(stream);
if (this.Version == 0x00010000 || this.Version == 0x00020000)
{
TtcTag = WoffUtils.TtcSignature;
this.MajorVersion = (ushort)(this.Version == 0x00010000 ? 1 : 2);
return(true);
}
return(false);
}
private bool ReadData(Stream stream)
{
if (stream == null)
{
return(false);
}
int bytesRead = 0;
byte[] header = WoffBuffer.ReadBytes(stream, WoffUtils.Woff1DirSize, out bytesRead);
_tag = WoffBuffer.ReadUInt32BE(header, 0);
_offset = WoffBuffer.ReadUInt32BE(header, 4);
_compLength = WoffBuffer.ReadUInt32BE(header, 8);
_origLength = WoffBuffer.ReadUInt32BE(header, 12);
_origChecksum = WoffBuffer.ReadUInt32BE(header, 16);
if (_origLength > 0)
{
_padding = WoffUtils.CalculatePadding(_origLength);
}
return(true);
}
private bool ReadData(Stream stream, bool isTrueType)
{
if (stream == null)
{
return(false);
}
var tableFlags = WoffTable.TableFlags;
int bytesRead = 0;
// UInt8: flags table type and flags
_flags = (byte)stream.ReadByte();
// The interpretation of the flags field is as follows:
// 1. Bits [0..5] contain an index to the "known tag" table, which represents tags likely to appear in fonts
int tagIndex = _flags & 0x3F;
// If the tag is not present in this table, then the value of this bit field is 63.
if (tagIndex >= 63)
{
// UInt32: tag 4-byte tag (optional)
_tag = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream, 4, out bytesRead), 0);
var name = WoffBuffer.TagString(_tag);
for (int i = 0; i < tableFlags.Count; i++)
{
if (string.Equals(name, tableFlags[i], StringComparison.Ordinal))
{
tagIndex = i;
break;
}
}
}
else
{
_tag = WoffBuffer.TagInt(tableFlags[tagIndex]);
}
// 2. Bits 6 and 7 indicate the preprocessing transformation version number (0-3) that was applied to each table.
int transformVersion = (_flags >> 5) & 0x3;
// UIntBase128: origLength length of original table
if (!WoffBuffer.ReadUIntBase128(stream, out _origLength))
{
return(false);
}
// UIntBase128 transformLength transformed length (if applicable)
// _transformLength = _origLength;
_compLength = _origLength;
_transformLength = 0;
// For all tables in a font, except for 'glyf' and 'loca' tables, transformation version 0
// indicates the null transform where the original table data is passed directly to the
// Brotli compressor for inclusion in the compressed data stream.
if (transformVersion == 0)
{
// "glyf" : 10, "loca" : 11
if (tagIndex == 10 || tagIndex == 11)
{
if (!WoffBuffer.ReadUIntBase128(stream, out _transformLength))
{
return(false);
}
_compLength = _transformLength;
}
}
// The transformation version "1", specified below, is optional and can be applied to
// eliminate certain redundancies in the hmtx table data.
if (transformVersion == 1)
{
// The transformation version 1 described in this subclause is optional and can only
// be used when an input font is TrueType-flavored (i.e. has a glyf table)
// "hmtx" : 3
if (tagIndex == 3 && isTrueType)
{
if (!WoffBuffer.ReadUIntBase128(stream, out _transformLength))
{
return(false);
}
_compLength = _transformLength;
}
}
if (_origLength > 0)
{
_padding = WoffUtils.CalculatePadding(_origLength);
}
return(true);
}
private bool ReadWoff2Fonts(Stream stream)
{
// 1. Read the collection font header
_collectionHeader = new CollectionHeader();
if (_collectionHeader.Read(stream) == false)
{
Trace.TraceError("Collection Font Error: Reading of collection header failed.");
return(false);
}
// 2. Read this collection font entries
var numFonts = _collectionHeader.NumFonts;
_collectionEntries = new List <CollectionFontEntry>(numFonts);
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = new CollectionFontEntry(i);
if (collectionEntry.Read(stream, _woffDirs.Count) == false)
{
return(false);
}
_collectionEntries.Add(collectionEntry);
}
// 3. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = _collectionEntries[i];
var woffFont = new WoffFont(_woffHeader, _collectionHeader, collectionEntry);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
for (ushort j = 0; j < collectionEntry.NumTables; j++)
{
var index = collectionEntry.TableIndices[j];
var woffDir = _woffDirs[index];
woffFont.AddDirectory(woffDir);
}
}
// 4. CompressedFontData: Contents of font tables, compressed for storage in the WOFF2 file.
int bytesRead = 0;
int bytesCount = (int)_woffHeader.TotalCompressedSize;
if (bytesCount != 0)
{
byte[] compressedBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
bool errorOccurred = false;
var memoryStream = new MemoryStream(compressedBuffer);
using (var brotliStream = new BrotliInputStream(memoryStream))
{
var decompressedStream = new MemoryStream();
brotliStream.CopyTo(decompressedStream);
decompressedStream.Seek(0, SeekOrigin.Begin);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
try
{
// bytesCount = (int)woffDir.TransformLength;
bytesCount = (int)woffDir.CompLength;
decompressedStream.Seek(woffDir.Offset, SeekOrigin.Begin);
var tableBuffer = WoffBuffer.ReadBytes(decompressedStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
woffDir.OrigTable = tableBuffer;
}
catch (Exception ex)
{
errorOccurred = true;
Trace.TraceError(ex.Message);
}
}
}
if (errorOccurred)
{
return(false);
}
}
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = _collectionEntries[i];
var woffFont = _woffFonts[i];
_woffFonts.Add(woffFont);
woffFont.EndDirectory();
}
return(true);
}
private bool ReadWoff2Font(Stream stream)
{
var woffFont = new WoffFont(_woffHeader);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
// 2. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
woffFont.AddDirectory(woffDir);
}
// 4. CompressedFontData: Contents of font tables, compressed for storage in the WOFF2 file.
int bytesRead = 0;
int bytesCount = (int)_woffHeader.TotalCompressedSize;
if (bytesCount != 0)
{
byte[] compressedBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
bool errorOccurred = false;
var memoryStream = new MemoryStream(compressedBuffer);
using (var brotliStream = new BrotliInputStream(memoryStream))
{
var decompressedStream = new MemoryStream();
brotliStream.CopyTo(decompressedStream);
decompressedStream.Seek(0, SeekOrigin.Begin);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
try
{
// bytesCount = (int)woffDir.TransformLength;
bytesCount = (int)woffDir.CompLength;
decompressedStream.Seek(woffDir.Offset, SeekOrigin.Begin);
var tableBuffer = WoffBuffer.ReadBytes(decompressedStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
woffDir.OrigTable = tableBuffer;
}
catch (Exception ex)
{
errorOccurred = true;
Trace.TraceError(ex.Message);
}
}
}
if (errorOccurred)
{
return(false);
}
}
woffFont.EndDirectory();
return(true);
}
private bool ReadWoff2(Stream stream)
{
_woffVersion = WoffUtils.Woff2Version;
uint sizeRead = 0;
// 1. WOFF2Header: File header with basic font type and version, along with offsets
// to metadata and private data blocks.
_woffHeader = new WoffHeader(WoffUtils.Woff2Version);
_woffDirs = null;
sizeRead = _woffHeader.HeaderSize;
Debug.Assert(sizeRead == WoffUtils.Woff2HeaderSize);
if (!_woffHeader.Read(stream))
{
return(false);
}
// 2. TableDirectory: Directory of font tables, containing size and other info.
uint offset = 0;
_woffDirs = new List <WoffTableDirectory>(_woffHeader.NumTables);
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = new WoffTableDirectory(i, _woffVersion, offset);
if (woffDir.Read(stream, _woffHeader.IsTrueType))
{
if (woffDir.IsTransformed)
{
_isTransformed = true;
}
_woffDirs.Add(woffDir);
offset += woffDir.CompLength;
}
}
// 3. CollectionDirectory: An optional table containing the font fragment descriptions
// of font collection entries.
if (_woffHeader.IsCollection)
{
var isLoaded = this.ReadWoff2Fonts(stream);
}
else
{
var isLoaded = this.ReadWoff2Font(stream);
}
// 5. ExtendedMetadata: An optional block of extended metadata, represented in XML format
// and compressed for storage in the WOFF2 file.
_metadata = new WoffMetadata(_woffHeader.MetaOffset,
_woffHeader.MetaLength, _woffHeader.MetaOrigLength);
if (_woffHeader.HasMetadata)
{
stream.Seek(_woffHeader.MetaOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.MetaLength;
var metaBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.Data = metaBuffer;
_metadata.OrigData = metaBuffer;
if (_woffHeader.MetaLength != _woffHeader.MetaOrigLength)
{
bytesCount = (int)_woffHeader.MetaOrigLength;
using (var brotliStream = new BrotliInputStream(new MemoryStream(metaBuffer)))
{
var origBuffer = WoffBuffer.ReadBytes(brotliStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.OrigData = origBuffer;
}
}
}
// 6. PrivateData: An optional block of private data for the font designer, foundry, or vendor to use.
_privateData = new WoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
return(true);
}
private bool ReadWoff1(Stream stream)
{
_woffVersion = WoffUtils.Woff1Version;
var woffFont = new WoffFont(_woffHeader);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
_woffHeader = new WoffHeader(WoffUtils.Woff1Version);
_woffDirs = null;
int sizeRead = 0;
sizeRead = _woffHeader.HeaderSize;
Debug.Assert(sizeRead == WoffUtils.Woff1HeaderSize);
if (!_woffHeader.Read(stream))
{
return(false);
}
_woffDirs = new List <WoffTableDirectory>(_woffHeader.NumTables);
// 2. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = new WoffTableDirectory(i, _woffVersion);
if (woffDir.Read(stream))
{
_woffDirs.Add(woffDir);
woffFont.AddDirectory(woffDir);
}
}
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
stream.Seek(woffDir.Offset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)woffDir.CompLength;
if (bytesCount == 0)
{
continue;
}
var tableBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
if (woffDir.CompLength == woffDir.OrigLength)
{
// table data is not compressed
woffDir.OrigTable = tableBuffer;
}
else
{
bytesCount = (int)woffDir.OrigLength;
var origBuffer = new byte[bytesCount];
using (var zlibStream = new ZLibStream(new MemoryStream(tableBuffer),
CompressionMode.Decompress, false))
{
int bytesStart = 0;
do
{
bytesRead = zlibStream.Read(origBuffer, bytesStart, bytesCount);
if (bytesRead == 0)
{
break;
}
bytesStart += bytesRead;
bytesCount -= bytesRead;
} while (bytesCount > 0);
}
woffDir.OrigTable = origBuffer;
}
}
_metadata = new WoffMetadata(_woffHeader.MetaOffset,
_woffHeader.MetaLength, _woffHeader.MetaOrigLength);
if (_woffHeader.HasMetadata)
{
stream.Seek(_woffHeader.MetaOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.MetaLength;
var metaBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.Data = metaBuffer;
_metadata.OrigData = metaBuffer;
if (_woffHeader.MetaLength != _woffHeader.MetaOrigLength)
{
bytesCount = (int)_woffHeader.MetaOrigLength;
var origBuffer = new byte[bytesCount];
using (var zlibStream = new ZLibStream(new MemoryStream(metaBuffer),
CompressionMode.Decompress, false))
{
int bytesStart = 0;
do
{
bytesRead = zlibStream.Read(origBuffer, bytesStart, bytesCount);
if (bytesRead == 0)
{
break;
}
bytesStart += bytesRead;
bytesCount -= bytesRead;
} while (bytesCount > 0);
}
_metadata.OrigData = origBuffer;
}
}
_privateData = new WoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
woffFont.EndDirectory();
return(true);
}
